I expect I will personally be ending up using Mil I's with Miniforts on my satellites... where before I was running Mil Is with a handful of turrets. I don't see a significant issue there. Mil stations stall, miniforts kill. That's all Mil stations ever really did, stall the enemy a bit, and a good chunk of threat wouldn't even translocate.
Now, are Mil II stations really worth it? No. They're a stepstone to Mil III, and that's for your whipping boy(s). Oh, sure, I'd fill in the gaps with 'em just because I could swap out some Mil Is for a bit better econ, but that's not really why I opened Mil II. Mil III is the only station that had serious effect on drifter traffic, anything lower would get overwhelmed, usually quickly if you tossed a few gravs into play too.
I'm sorry, but I afraid I just don't see the Mil station as being a system protector. It's always been a support unit to the actual protectors. The only difference I see here is that mini-forts will not tax my turret caps for minor satellite defenses.